Vmware, Inc.

Sun Microsystems, Inc.

Oracle America, Inc.

Peter Farkas

Hari Sivaraman

Uday Pundalik Kurkure

Xingze He

Daniel S Rice

Stephen K Howell

Clifford Reader

Yan Zhang

A method includes displaying a bitmap of unique groups of colored tiles on the display screen and reading a color value of a first pixel in a first tile in the bitmap. Color values of tiles within the first tile's group are determined. The position of the first pixel within the first tile is determined. The position of the first tile's group within the bitmap and the position of the first tile within the bitmap are also determined. The position of the first pixel in the bitmap and the position of the bitmap on the display screen are calculated. A performance metric is calculated based at least in part on the position of the bitmap on the display screen.

Tracking window position in a VDI environment

Techniques disclosed herein provide an approach using pixel perturbation to transmit information. In one embodiment, a pixel perturbation engine perturbs pixels of an image to encode meta-information therein. In particular, the perturbation engine may perform controlled perturbation of pixel bits which are unlikely to affect visual quality are perturbed, such as perturbing the least significant bits in one or more channels of a RGB or YUV image. Higher order bits may also be perturbed in color channels such as the blue or UV channels that the human eye is less sensitive to. To mitigate loss of information, the information may be encoded using error correcting codes. After the image having meta-information encoded therein is transmitted to a client device, the meta-information may be recovered and used to determine performance of the virtual desktop infrastructures (VDI) system.

Pixel perturbation for transmission of meta-information

Techniques disclosed herein provide an approach using pixel perturbation to measure image quality. In one embodiment, a pixel perturbation engine perturbs pixels in an image with a reference image for measuring quality of the image after transmission. By perturbing least significant bits, a composite image may be generated in which the reference image is hidden in the original image. The perturbations in the composite image may then be recovered after the composite image is transmitted to a remote device and used to determine image quality based on preservation of the perturbations. In another embodiment, image(s) perturbed with reference image(s) at increasingly higher order bit positions may be transmitted, and quality of the transmitted reference image determined, until the determined quality exceeds a threshold, with the perturbed bit position at which the determined quality exceeds the threshold being indicative of the quality of the image(s) transmitted.

Pixel perturbation for image quality measurement

A method including receiving a set of input data in a first matrix format. The method further includes compressing the set of input data to obtain a first set of compressed data in a second matrix format, where compressing the set of input data includes using a quantization equation, the quantization equation including Yq(i,j)=[(Y(i,j)+offset)&#x3c;&#x3c;n]/qs, where Yq(i,j) represents a coefficient in a matrix of the first set of compressed data having a coordinate (i,j), Y(i,j) represents a coefficient in a matrix of the set of input data having the coordinate (i,j), offset is an integer, &#x3c;&#x3c; is a first bit-wise shift operator, n is an integer, qs is a real number. The method also includes sending the first set of compressed data to a first destination.

Method and system for linear quantization and dequantization

In a processor, a method for performing table-lookup transformation through a look-up table a source image having a plurality of source pixels to derive a destination image having a plurality of destination pixels. The method includes the step of deriving, for each value in a source pixel of the plurality of source pixels, a look-up result. The aforementioned look-up result represents a value in a corresponding destination pixel of the plurality of destination pixels. The method further includes the steps of loading a plurality of the look-up results into a plurality of graphics registers in the processor and accumulating the plurality of the look-up results in the plurality of graphics registers into an accumulation register in the processor. Additionally, there is also provided the step of storing the accumulation register into the destination image.

Growing community of inventors

Santa Cruz, CA, United States of America

Peter Farkas